There are numerous reasons why emails may go undelivered:
Invalid Email Addresses: Incorrect or outdated email addresses can result in undelivered emails. Spam Filters: Emails flagged as spam by email service providers often don't reach the recipient's inbox. Mailbox Full: If the recipientâs mailbox is full, incoming emails may be rejected. Server Issues: Temporary or permanent issues with the recipient's email server can prevent delivery. Authentication Failures: Lack of proper email authentication methods like SPF, DKIM, or DMARC can result in emails being rejected.